Simplify the transform iterators.
Revert "Simplify the transform iterators."

This reverts commit 2fae677ff45dae2fb00454fbfe0e9e55cf01303f.
More const forcing and simplifications.
Return the proper isolate handle type.
Correct Core version dependency.
Support for environment passing in CGroups.
Declare environ explicitly as in environ(7).
Git ignore file extended: cmake files, compiled files and ide projects are ignored
Timer service added. Timer service allows to create timers that notify once, every n seconds, cancel already running timer and restart it.
Debianization added for services: cache and timer
Renamed Timer -> Time Service as per ticket.
Actually, rename Time Service to Chrono Service.

So that our old records and deploy lists for plugin-chrono will be still
useful, which always makes system administrators happy.
Changelog bump.
Logstash plugin introduced

 - logs can now be redirected to the logstash instance

Typical config:
```
...
"loggers": {
  "core": {
    "type": "logstash",
    "args" : {
      "host": "0.0.0.0",
      "port": 50030,
      "verbosity": "debug"
    }
  }
}
...
```
Merge branch 'master' of github.com:cocaine/cocaine-plugins

Conflicts:
	CMakeLists.txt
Merge branch 'master' of github.com:cocaine/cocaine-plugins
Debianization and code style for Logstash.